people who have access to the necessary healthcare systems can lead relatively normal life if the treatment is successful. >> scientists now know a lot about the virus that leads to aids, but decades of research have failed to render the virus harmless. experts say there is little hope of the vaccine soon, because the virus changes rapidly over time. >> i don't think we will see that miracle happen before the end of my medical career. hiv is really very tricky. >> despite the difficulties, scientists continue their battle against the virus. researchers in the u.s. recently discovered antibodies in the blood of infected patients, which can neutralize the majority of hiv strains even as the virus changes. another line of research is examining the genetic makeup of the few individuals with natural resistance to the virus in the hopes of isolating the gene responsible. but scientists say both strategies are unlikely to yield results soon. he wants to find a way to -- for people to live with the virus without relying on drugs for the rest of their life. >> how do apes managed to live with hiv? t